Cel disappearing

So here’s the basic information before I discuss my issue . 1992 stock obd1 integra . Recently when I have been driving I will get a check engine light , pull over an turn my DA off than jump my scs . Then there’s nothing stored. Even got the check engine light occur again and leave the car running nothing happens no flash or anything . An out of curiosity I unplugged map sensor an it came back on, but went to jump it since it actually stored this time an it will not flash. Any clues to why this is going on? Grounding issue scs not working?

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What’s “SCS” ?

I believe that’s what it’s called the the connector that you jump to make your check engine light flash . Correct me if I’m wrong